<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>file_2</title>
		<script type="text/javascript">
			let dog = {
				name : "coco",
				type : "阿拉斯加犬",
				age : "5岁",
				color : "棕红色"
			};
			
			for(let lep in dog){
				console.log(lep);
			}
		</script>
	</head>
	<body>
	</body>
</html>